User need to join sepcific VO to use grid resource.
Registration page for the VO: https://lcg-voms.cern.ch:8443/vo/VOname/vomrs where VOname need to be replaced with the correct VO name. Common large VOMRS VO links to be used are ATLAS, ALICE, CMS, LHCb and DTEAM
1. Go to APROC, select "Virtual Organizations", choose which vo you want to join. 2. Finish the Registration Procedure, be sure to that you have imported a new user certificate into your browser when you try to apply for a membership.